. ♪ my name is skylar >> reporter: loved by teens and young adults, turning dance videos and lip-syncs million users worldwide, tiktok has cemented its place in pop culture history favorited by stars like ariana grande. ♪ ♪ got me working side to side >> reporter: britney spears. >> i focus on getting a six pack. so here i go. >> reporter: and reese witherspoon. >> now look at me. my actions are -- >> reporter: but this morning the wildly popular app, which is owned by a chinese company, is reportedly under federal investigation. the u.s. government reportedly launching a national security review of the company's data collection and censorship practices amid concerns that users' personal data could be accessible to foreign governments. in 2017, the beijing-based company purchased musical.ly, and merged into tiktok, opening its headquarters in california coming to the attention of several u.s. senators worried that tiktok could be a target of foreign manipulation after russia's attempts to interfere with the 2016 u.s. election through facebook. senator marco rubio calling for a review s